%N n is a term iff there are no prime numbers between reverse(n) and 3*n.
%C n such that the number of primes between n and 3n (inclusive) = number of primes between n and reverse(n) (inclusive).
%e 14 is here since there are seven primes between 14 and 41 and seven primes between 14 and 3*14=42.
%A _Jason Earls_, Sep 08 2002
%E More terms from _Lior Manor_ Sep 17 2002